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G. w. LUDOVICI. SELP ACTING BRAKEYPOR ELEVATORS.

No. 517,755. Patented Apr. 3, 1894.

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G W LUDOVIGI SELF AOTING BRAKEf-FOR BLEmTqgs,

No. 5173755., Patented A r; $1894.

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(N0 ModeL} G. W. LUDOVICI SELF ACTING BRAKEPORBLEVATORSQ No. 517,755.Patented App. 3, 1894.

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UNITED. STATES PATENT OF ICE.

shone WIL ELM LUDovIcI, OF, cAssEL, GERMANY.

sELF- Acfl NG BRAKE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 517,755, dated April 3,1894. A uaa filed August 14,1 93. serial No. 483.090- (No ode cagehaving a platform b.

To all whom it mwyconcerm- V r Be it known that; I, GEQBG WILHELM LU-DovIOLof ,Oassel, in the Empire of Germany, have invented new and usefulImprovements in-Self-Acting Brakes for Elevators, of which the followingis a specification,reference being had therein to the accompanyingdrawrngs.

The object of my inventioh is to fit elevators with improved safetybrakes to arrest the movement of the cage in case of the breakage of thelifting rope or cable. And in order that my said invention may beparticularly described and ascertained, reference is hereby made to theaccompanying, drawings, in which similar letters of referenceindicatecorresponding parts. p

Figure 1 is an elevation of an elevator fitted with my improvements, theropes being shown intact, and the brakes out of action. Figs. 1 and 1represent cross section s through the guides, cage irons and brakeframe, on lines 1- 1 and 2 2 respectively of Fig. 1.

Fig. 2 is a side view'of Fig. '1. Fig. 3 is an elevation, partly insection, showing the brakes in operation. Fig. 3 represents a transversesection on line 33 of Fig. 3.-

In the drawings 1) represents the elevator Surrounding the cage 1) is arectangular frame a having guid,-- ing portions 0. for engaging thevertical guide rails h h and the cage b isconstructed so as'to movevertically with respect to said frame a, and beguided by the verticalguiding portions a. The brake mechanisms are fitted to the frame a aboveand below the cage 5 and are adapted to be instantly forced intooperation by the downward movement of the cage in the frame a. v

The upper brake mechanism comprises two levers c c, pivoted to the framea at dd. 9 g

are two wedge shaped brake blocks, with ser rated contact surfaces,pivoted at 2' t' to the short arms of the levers c c. 0 0 are weightsfitted to thelong arms of the levers c c. 70 k aresprings, one end ofeach spring being attached to the frame a, and the other end to thelever c, as shown. The object of the weight 0 and spring his to renderthe operation of the brake certain'so that, in case the spring 10 shouldfail, the weight would cause the lever to apply the brake. In ordinarycases however the springs Z0 and weights 0 operate together. jj arestationary cams secured to the frame a and providedwith inclinedsurfaces which hold the brake blocks 9 in position pressing them againstthe guide rails h h, when raised by the short arms of the levers c c. II

The lower brake comprises 'two levers Z Z pivoted to the frame'a at p p.m m are two wedge shaped brake blocks pivoted at s s to the short armsof the levers Z Z. 'n n are stationary cams secured to the frame aandprovided with inclined faces to hold the brake blocks in position, whenraised by the short arms of the levers Z Z. The long arms of the leversZ Lare in contact above and below with portions hf the frame work of thecage 19, in this instance plates 6 under the floor of the cage. V

The cage is sustained by, two forked .strap's ff through which thelovers 0 0 pass. e e are two pins secured to the straps ff which liftthe levers 0 when the cage is sustained by the straps f f. Each strapcarries a loose pulley at itsupper end for receiving the rope.

In the drawings I have shown a third rope engaging a strap e secured tothe central por- ,tion of the bar b of the cage.

This rope is secured to a suitable counter balance weight, not shown, asis usual in elevators.

The operation is as follows: When the cage is sustained by the ropes orcords; as shown in Fig. 1, the upper cross. bar b of the frame work ofthe cage b is raised into contact with the upper part of the frame a.The pins e e lift the long arms of the levers c c, and thereby withdrawthe brake blocks 9 g from contact with the guide rails h h. In likemanner the raising of the plates 12 of the cage b in the frame a, liftsthe long arms of.

h andthe lowering of the plates b b of the cage, whereby the wedges g gand m m are :The long arms of the levers c c and Z Z are then depressedby the weights 0 0, springs h jammed between the cams j and and 'n. andthe guide rails h It, thus arresting themotion of the cage immediately.Should the cage be again raised, all the wedges are immediately releasedand the cage is free to move.

\Vhat I claim, and desire to secure by Letters Patent of the UnitedStates, is

1. In an elevator the combination with the cage, of an independentlymovable frame, normally supported thereby, movable brake blocks securedto said frame, stationary cams secured to said frame in position to beengaged by said brake blocks, devices connected with the cage fornormally holding said brake blocks out of operation, and means forforcing said blocks into engagement with the said cams to apply thebrakes, on the downward movement of said cage in respect to said frame,substantially as described.

2. In an elevator the combination with the vertical guide rails and themovable cage, of an independently movable frame, normally supported bysaid cage, and provided with movable brake blocks for engaging saidrails, cams secured to said frame in position to be engaged by saidblocks, devices connected with the cage for normally holding said blocksout of engagement with cams, and devices connected with said blocks forthrowing them into engagement with said cams, and guide rails, on thedownward movement of the cage with respect to said frame, substantiallyas described.

3. In an elevator the combination with the guide rails, and the movablecage, of an independently movable frame, normally supported by saidcage, and provided with movable wedge shaped brake blocks for engagingsaid rails, stationary cams secured to said frame in position to engagesaid blocks, devices connected with said cage for normally holding saidblocks out of operation and devices for throwing said wedge shapedblocks into engagement with said cams and guide rails on the downwardmovement of the cage, with respect to said frame, substantially asdescribed.

4. In an elevator the combination with the guide rails, and movablecage, of an independently movable frame, normally supported by saidcage, and provided with wedge shaped brake blocks, pivoted leversconnected with said brake blocks, and provided with springs for throwingsaid blocks into operation, stationary cams secured to said frame inposition to be engaged by said blocks and devices connected with thecage for engaging said levers and normally holding said brake blocks outof operation, substantially as described.

5. In an elevator the combination with the guide rails and movable cage,of an independently movable frame normally supported by said cage,provided with two pairs of brake blocks, one pair being provided withsprings for throwing them into engagement with the rails, and the otherbeing operatively connected with said cage, and devices connected withthe cage for normally holding said spring actuated brake blocks out ofengagement with said rails, whereby the downward movement of the cagewith respect to said frame will force one pair of brake blocks directlyinto operation and release said spring actuated brake blocks,substantially as described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

GEORG lVILI-IELM LUDOVIGI.

Witnesses:

RUDOLF SEIDEL, CARL Baiioimna.

